Stripping machine



H. K. SCHILLING STRIPPING MACHINE July 29, 1958 3 Sheets-Sheet 2 Filed May 4, 1955 ATTORNEY July 29, 1958 H. K. SCHILLING I 2,845,011

STRIPPING MACHINE Fiie'd May 4, 1955 s Sheets- Sheet :5

flay/2 A. Salli/[i119 ATTORNEY INVENTOR United States Patent STRIPPING MACHINE Hugh K. Schilling, Minneapolis, Minn., assignor to Horton Manufacturing Co., Inc., Hennepin County, Minn., a corporation of Minnesota Application May 4, 1955, Serial No. 505,947 18 Claims. (Cl. 93-36) This invention relates to an improvement in stripping machines and deals particularly with an apparatus for stripping waste stock from blanks of corrugated paper-- board or the like.

In the formation of cartons and containers formed of paperboard, corrugated paperboard fiber and the like, it is usual practice to diecut the blank from a sheet of paperboard. Oftentimes the paperboard sheet'is large enough to form several blanks in side by side relation. One of the expensive parts of the production of such cartons or containers is in the stripping of the waste stock from the blank. In many instances the containers or cartons are 2,845,011 Patented July 29, 1958 ICC provided with suitable openings through which interior portions of the blanks may be forced.

These and other objects and novel features of my in- I vention will be more clearly and fully set forth in the following specification and claims.

In the drawings forming a part of the specification: I Figure 1 is a side elevational view of the stripping device showing the construction thereof.

Figure 2 is a front elevational view of the apparatus shown in Figure 1.

Figure 3 is a perspective view showing the manner in which the supports for the blanks may be supported and adjusted.

Figure 4 is a perspective view showing the manner in which the punch supports are a-djustably supported.

Figure 5 is a sectional view through the table and through the blanks showing the manner in which the waste stock is stripped.

Figure 6 is a side elevational view of the device when arranged for use as a stripper for the sheet margin.

Figure 7 is a sectional view through one of the springs used for holding the blanks in place.

Figure 8 is a sectional view through the outer table frame showing the alternate table in place therein.

Figure 9 is a top plan view of the table for supporting the blanks during the stripping of the margin thereof.

formed withopenings therein and the material within the 7 opening must be stripped out by a stripping operation. In many cases this must be done by hand, particularly in the case of diecut members made of corrugated paperboard and solid fiber. These parts are usually cut on a platen press and it is necessary to keep -all of the parts Figure IO-is a perspective view of one of the guides for holding the blanks in proper relation upon the table. a

The stripping device is indicated in general by the letter A and; includes a heavy base including a forwardly extendingbase member 10 having a laterally extending support 11 at its forward end. A standard 12 extends upconnected until each sheet is removed from the press.

The blanks are usually stackedone above the other and the waste parts are stripped by use of a hammer with or without the use of a punch or similartool.

An object of the present invention resides in the provision of apress which is provided with readily adjustable punches. These punches may be quickly and easily arranged to engage the portions'ofthe stock to be stripped away from the'blanks so that this waste stock may be stripped. The locationof the punches may be readily varied to use blanks of different type.

A further feature of the presentinvention resides in the provision of a'stripping device including a table formed with 'a series of adjustable slats or braces on which the blanks may be placed. The location of the'slats may be easily adjusted to support-the bodies of the'blanks and to permit waste portions of the blanks to be stripped therethrough between the slats.

A further feature of the present invention resides in the the stripping This device comprises aspringwhich engages'the upper surface of the blanks, to holdthe' blanks against the table during the stripping operation. I

A further feature of the invention resides in the provision of an alternatetable'on which the blanks may be placed when the outer-periphery of thesheet is to be stripped from around the blanks. In this arrangement the table forms an island on which the blanks are placed.

and the punches are set to strip the frame: or periphery otthej heetfmm a u d e bl n s- "l:he;-ta ?yb wardly from the rear of the base member 10 and this standard is connected to the base by a suitable reinforcing The standard 12 supports a forwardly extending arm "14 havin'g at its forward end a vertical attachment plate 15. Abrace 16 connects the standard 12 with the arm 14in order to reinforce this arm. In the particular arrangement illustrated the brace 16 is shown extending downwardly from the standard from a point on the standard above'the arm 14. In other constructions the brace arm 16 extends upwardly between the standard 12 and the bottom of the arm 14, leaving the upper surface of this arm free for the support of mechanism of one type or another. A bearing sleeve 17 is mounted vertically upon the attachment plate 15. A vertical reciprocableplunger 19 is slidably supported for vertical movement. in 'the. bearing sleeve 17. A horizontal plate 20 of substantial area is mounted upon the lower end of the plunger 19 and is held in horizontal position by suitable reinforcing gussets 21. The plate 20 is usually generally rectangular in. shape and serves as a support'for thepunches which are designed to strip the waste stock from the blanks. a. a a

A pneumatic cylinder 22 is mounted in axial alignment with the hearing sleeve 17 and contains a piston not illustrated in the drawings which is connected to the plunger .19 inany suitable manner. In other words," the plunger-19 is moved vertically by the piston within the pneumatic cylinder 22 in a manner well known in the art. A control mechanism 23 is mounted upon the arm 14 -amiis designed to control the flow of fluid to the cylinder :22. The control mechanism is connected by flexible conduits 24 to a pair of operating valves 25 The arrangement is such mounted-upon the plate 20; thatbothof these valves must be manually operated in order-:to' cause the control mechanism to direct air.to

the ttopyo'f the cylinder 22 so as to lower the plate 20. I

This. arrangement is. made so that the hands of the'operatormust be on the. controlling valves 25 to cause the -pla,te,.20 tomove downwardly. This prevents accidental 3 engagement of the hands in the mechanism. The plate 20 is designed to support a series of channel-shaped punch supports indicated in general by the numeral 26. The punch supports 26 are generally channel-shaped in form, having a base 27 which is supported at the top of the support and parallel sides 29 and 30 extending downwardly from the base 27. Inturned flanges 31 and 32 are provided on the punch supports 26 leaving a slot or passage 33 therebetween. This slot 33 is of suflicient width to accommodate the shanks of bolts supporting the 7 various punches, as will be later described in detail.

As is best indicated in Figure 4 of the drawings, each end of each of the tool supports 26 is adjustably secured to the plate 20 by means of a clamp 34. The clamp 34 comprises a block-shaped body having a downwardly projecting ledge 35 near its outer side and a lip 36 designed to overlie the surface of the plate 20. A clamping bolt 37 extends through the clamp 34 and into the base 27 of the channel-shaped support 26 to clamp the support in adjusted relation to the plate 20.

From this description it will be seen that the various supports 26 may be moved transversely'of the supporting plate 20 so as to be located immediately above a portion of, the blank to be stripped. Each support 26 may support one or a considerable number of punches, the punches being adjustable forwardly and rearwardly throughout the length of the supports 26.

The punches are indicated at 39 and are best illustrated in Figure of the drawings. an upper extremity 40 of increased diameter which is internally socketed and threaded to accommodate a clamping bolt 41. Each clamping bolt 41 is provided with an enlarged head 42 designed to ride within the support 26 and includes a bearing portion 43 immediately beneath. the head 42 which bears against the sides of the slot 33. By rotating each punch relative to the bolt 41 supporting the punch to the support, the punch may be firmly anchored in vertical position to project downwardly from the plate 20. It will be obvious that by moving the punch supports laterally to the proper location and adjusting the punches forwardly and rearwardly to the desired extent, a punch may be positionedto engage any portion of the blank which is to be stripped. Where there are large interior areas to bestripped, a plurality of punches may engage the same part.

In order to hold the blanks in proper relation during the punching operation, stops are provided for engaging at least two adjoining sides of the blanks. Thestops for the rear of the blanks may comprise arms such as 44 which extend upwardly from one or two of the supporting slats. Also a pair of arms 46 may extend upwardly from one of the slats 45 to form a side guide for the blanks which are indicated in certain of the figures by the letter B.

The apparatus includes a table designed to support:

are vertical strips of material having notches 54 at their upper ends so that the strips may fit within thechannelshaped frame with the. upper surfaces 55 of the strips on the same level as the upper surfaces of theframe flanges 51. The lower edges of the slats 45 rest upon the frame flanges 52 and are supported thereby. Brackets 56 are bolted or otherwise secured to the ends of the slats 45 as indicated at 57. The brackets 56 include a flange 59 designed toextend beneath the adjacent frame" Each punch includes In Figure 5 of the drawings the forflange 52. A set screw 60 extends through each of the flanges 59 to engage against the under surface of the flange 52 and to hold the slats 45 in an upright adjusted position.

The operation of the apparatus described to this point is believed obvious from the foregoing description. The blanks B are placed upon the upper surfaces of the slats 45 bridging opposite sides of the table. The slats are positioned to extend on each side of the various areas to be stripped. The punches are then moved into proper position to engage the areas to be stripped, the punch supports being laterally adjustable and the punches being adjustable forwardly and rearwardly.

The blanks are properly located and the guides are positioned so as to hold the blanks always in the same location. In adjusting the apparatus, it is usual practice to lower the plate 20 to an elevation where the punches would extend just above the upper surfaces 55 of the slats 45. I The plate may be held in this position against the tendency of the apparatus to raise it by the engagement of a nut 61 on a pivoted threaded rod 62 with a bracket 63 attached to the plate 20. The rod 62 is pivoted at 64 to the arm 14 and is normally held out of the path of the bracket 63 by a spring 65. Once the apparatus has been set, the waste may be stripped by merely placing a stack of blanks upon the table against the back and side guides, engaging both valves 25 with the hands. The air lowers the table, the punches extending through the blanks, stripping the waste areas therefrom. The stripped portions extend between the slats 45 and drop to the floor beneath the table.

The sides of the table are usually supported by braces such as 66 illustrated in Figures 1 and 2 of the drawings. In order to hold the table 20 from rotation with respect to the base, a vertical guide 67 is attached to the frame 47 of the table to extend upwardly therefrom. This guide 67 slides in a suitable bearing 69 attached to the plate 20 to hold the plate from rotating about the axis of the plunger 19. In Figures 6 through 10 of the drawings is disclosed an auxiliary table which may be used in conjunction with the remainder of the apparatus. A pair of inverted U-shaped. clamping brackets 70 are shaped to fit over the forwardly extending frame member 10 and to rest thereupon. Braces 71 are secured to the bracket 70 to extend upwardly therefrom in diverging relation as indicated in Figure 8. A flat table 72 is mounted upon the upper ends of the braces 71 and the upper surface of the table 72 is flush with the upper surface of the table frame 47. A pair of back guides 73 are attached to the rear frame member 50 to extend forwardly therefrom. The guides 73 have a horizontal attachment plate 74 which is slotted to permit forward and backward attachment of the guides 73. These guides are provided with upwardly extending forward ends 75 against which the rear edges of the blanks may engage.

A side frame member of the frame 47 may also serve as a support for a side guide 76' to locate an edge of the stack of blanks. The guide 76 may be provided with a horizontal flange 77' which is slotted for receiving a clamping bolt 79. Accordingly, the'guide may move within limits in a lateral direction. The guide is provided with an upwardly projecting end 80 against which the blanks engage. Y

The table 72 is shown in Figure 9 of the drawings to be cut to the shape of the blanks which are being stripped. It will be noted that the table forms an island supporting the stack of blanks, for when-this structure is used the ,blanks are encircled by a frame of stock which must be removed. The punches are adjusted to engage this peripheral frame at spaced locations so as to force the frame downwardly from about the blanks, leaving the blanks supported upon the table". Apertures such as 81 may be provided through the table to accommodate interior portions of'the blanks which may be forced therethrough by suitably positi'onedpunches. Another peripheral rim-of '5 the'sheets is stripped as with the arrangement shown in Figures 6 through 10, the blanks having a tendency to bow upwardly at the center, particularly if the sheet is.

cut into a plurality of blanks by interior cutlines. In order to hold the blanks during the stripping operation and to prevent them from sliding or bowing, a spring device may be employed which is of the type shown in Figure 7 of the drawings. Figure 7 shows a spiral tapering spring 82 having a large diameter lower end 83 which may engage against the upper surface of the blank and having a small diameter upper end 84. The small diameter end 84 encircles a plug 85 and is attached thereto in any suitable manner, the plug extending axially of the spring 82. The plug 85 has an interiorly threaded central aperture 86 designed to accommodate a clamping screw 87 having an enlarged head and having a bearing portion 89 immediately beneath the head which is engageable in the slots 33 of the punch supports 26. The springs are attached in the punch supports by loosening the bolt 87 holding each spring and in sliding the spring to its proper location. The spring is then twisted to tighten the spring upon the bolt 87, clamping the spring punch in place.

Thus it will be seen that through the use of the apparatus scrap stock may be stripped from either an in-v terior portion of the blanks or from the periphery thereof, the auxiliary table being used for the latter portion. In either event, the same punch and adjustment arrangement may be employed.

In accordance with the patent statutes, I have described the principles of construction and operation of my stripping machine and while I have endeavored to set forth the best embodiment thereof, I desire to have it understood that obvious changes may be made within the scope of the following claims without departing from the spirit of my invention.

I claim:

1. A stripping device including a table having parallel opposite sides, a series of supporting bars extending between said sides and adjustably connected thereto, a punch device, means supporting said punch device for movement toward or away from the table, said punch device having parallel opposite sides, a series of punch supports adjustably supported by said parallel sides to extend therebetween, means on said punch supports engageable with said parallel opposite sides to hold said supports at right angles to said sides, and a series of punches adjustably supported by said punch supports, said punches being adjustable longitudinally of said supports.

2. The structure decribed in claim 1 and in which said punch supports comprise inverted channel-shape members having opposed internal flanges between which the upper ends of the punches extend.

3. The structure described in claim 1 and in which the punches comprise cylindrical shanks projecting vertically downwardly from said punch supports.

4-. A stripping device comprising a table, a punch device relatively movable toward and away from said table, said punch device including a body having generally parallel sides, punch supports extending between said sides, means 011 said punch supports engageable with said parallel sides to hold said punch supports at a predetermined angle thereto, and adjustably connected to said punch device adjacent said sides, and punches longitudinally adjustably supported by said punch supports, said table having apertures through which said punches extend.

5. The structure described in claim 4 and in which said tion between opposite sides of said frame, said, supports ending into said channel-shaped frame for support thereby, and means for anchoring the ends of said supports in adjusted relation to said frame, and punch means including spaced punches relatively movable toward and away from said table to strip waste stock from blanks supported upon said table and forcing the stock through said table between said supports.

7. The construction described in claim 6 and in which said means for adjustably securing said supports in place comprise clamps.

8. A stripping device comprising a table including a generally rectangular frame, a series of parallel supports slidably supported by and extending between two parallel sides of said frame, said supports being movable toward and away from the remaining parallel sides of said frame, a plate parallel to said table and relatively movable toward and away from said table, said plate having parallel edges, a series of punch supports beneath said plate be tween two parallel sides thereof, means on the end of said punch supports adjustably connecting the same in adjusted position to said plate, and punches adjustably supported by said punch supports, said punches extending downwardly toward said table and arranged to extend between said supports forming a part of said table.

9. The construction described in claim 8 and in which said punches comprise sockets having adjustable heads, said heads being slidable longitudinally of said punch supports and being adjustable to hold said punches in fixed relation relative to said punch supports.

10. The construction described in claim 8 and in which said punch supports include generally rectangular tubular bodies having longitudinally extending slots in their under surfaces, said punches extending through said slots and including means for clamping said punches on opposite sides of said slot.

11. A stripping device for stripping waste stock from a stack of blanks, the device including a table, a punch member relatively movable toward or away from said table, a series of punches individually adjustably supported upon said punch member and designed to engage waste portions of said blanks upon relative movement of said punch member toward said table, said table having apertures therethrough through which the waste stock may be forced, and means for moving said punch member relative to said table.

12. The construction described in claim 11 and including individually adjustable guides mounted on said table for locating said blanks relative to said table and to said punches.

13. A stripping device for stripping waste stock from a series of superimposed paperboard blanks, the device including a table having a frame including generally parallel sides, a series of supports slidably supported by said sides for movement longitudinally of said sides, means for adjustably mounting said supports on said sides, punch means relatively movable toward and away from said table to move against portions of said blanks, and guides supported by certain of said supports and movable therewith for locating said blanks relative to said supports and relative to said punch means.

14. A stripping device for stripping paperboard blanks of predetermined outline, the device including a table having an outline corresponding to the outline of said blanks, a punch device movably supported relative to said table for movement toward and away from said table, said punch device including a series of elongated punches supported with their longitudinal axes generally normal to said table, said punches being supported to engage waste portions of paperboard encircling said blanks and operable upon movement of said punch means toward said table to strip said marginal portion from said blanks.

15. The construction described in claim 14 and including resilient means supported by said punch device and engageable with said blanks prior to the engagement of "said punches with'the Waste portion encircling said blanks.

16. The construction described in claim 14 and including generally conical spring means supported by said punch device and engaging'said blanks upon movement of said punch device toward-said blanks prior to the 'engagement of said punches with said waste portions encircling said blank.

17. The construction described in claim 14 and including guide means supported adjacent to said table and engageable with the waste portion encircling said blanks to properly locate said blanks relative to said table.

References Cited in' the file of this patent UNITED STATES PATENTS 1,939,478 Whistler Dec. 12, 1933 1,948,187 Randall Feb. 20, 1934 2,572,537 Taylor Oct. 23, 1951 

